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Koninklijke kweekerij Moerheim voorheen B. Ruys:
Catalogus van vaste planten, rozen, heesters, boomen, enz. enz. 1939. Dedemsvaart, (1939), volume 51, pp. 112, numerous text-illustrations (photos), 4to (180 x 260 mm), stiff colour-illustrated wrappers (with numeral). Cover and inserted colour-plate of Delphinium ruysii Pink sensation after painings by Esther Bartning. € 40
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